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r <br /> %.' .J <br /> January 14,2003 <br /> Job Number:LG02460 <br /> Page 6 <br /> Specialist of the San Joaquin County Environmental Health Division. The following table <br /> presents a summary of the percolation tests. <br /> L <br /> Table 3. <br /> r <br /> Summary of Percolation Test. <br /> ------------------ <br /> FfDesignated <br /> o. Test Period Test Depth_F <br /> Percolation Rate Comment <br /> r (Hrs) (tt) (minutes/inch) <br /> 4 3.15 10.7 Passed Test <br /> er, 4 3.01 16.7 Passed Test <br /> (43.3-acres) <br /> r <br /> A satisfactory percolation rate is less than or equal to 60 minutes per inch(drop) per County <br /> 6. requirements. The percolation rate of the soil on each parcel was found to be satisfactory. <br /> 6.0 NITRATE LOADING STUDY <br /> r <br /> A build up of nitrates in ground water can cause a temporary blood disorder in infants called <br /> methemoglobinemia(blue baby syndrome). Serious and occasionally fatal poisonings of infants <br /> r have occurred following the ingestion of water containing nitrate concentrations greater than 10 <br /> mg/L nitrate as N or 45 mg/L nitrate as NO3. <br /> Because of the concern of nitrate leaching into ground water, a nitrate loading analysis was <br /> performed to estimate the average nitrate concentration of percolating water for each parcel. If a <br /> site is contributing excess nitrogen to ground water, ground water quality can be impacted. The <br /> r nitrate sources considered for this project are percolating septic effluent from proposed facility, <br /> and deep percolation of rain water containing nitrate. <br /> r <br /> The method utilized in this analysis is based on a simple mass balance formula discussed in a <br /> published article by Hantzsche and Finnemore'that provides a convenient and simplified method <br /> r. <br /> 7 Hantzshe N.N.,Finnemore,E.J. 1991,Predicating Ground-Water Nitrate-Nitrogen Impacts. Ground <br /> r Water,Vol.30,No.4. <br /> OE <br />